Abstract: An apparatus (30) for adjusting the phase of signals supplied to each element (E1-E8) of an antenna having a plurality of antenna elements, each element having a respective transmission line (34a, 34b) associated therewith, the apparatus comprising first supporting means (32) having a plurality of said transmission lines (34a, 34b) disposed thereon, and second supporting means (36), movable relative to said first supporting means (32), having a plurality of coupling links (38) disposed thereon. Each of said coupling links (38) comprises a length of transmission line arranged to capacitively couple with at least one of said transmission lines (34a, 34b) such that movement of said second supporting means (36) relative to said first supporting means (32) alters the effective length of one or more of said transmission lines (34a, 34b).

Abstract: An antenna system comprises an antenna assembly having a plurality of elements mounted upon an antenna carrier and arranged in at least two sub-arrays. Each sub-array includes one or more of said elements. The system also includes control means arranged to electrically control the phase of signals supplied to at least one of said sub-arrays from a location remote from said antenna assembly, wherein said control means comprise first and second phase adjustment means for connection to a respective one of said sub-arrays, thereby to adjust the phase of signals supplied thereto. An additional mechanical phase adjustment arrangement is provide for further adjusting the phase of signals supplied to each element of the antenna assembly.